S40 "Emergency hazards"-driving me mad.
Discussion
Perhaps a bit of driver training may help to improve your anticipation of when you're likely to need to come to a stop. The hazards only come on once you've dropped below 6mph. Hard braking such as that experienced when pressing on (normally above 6mph!) will only result in the brake lights flashing. There is no internal indication of this happening so isn't annoying.
You are setting off the "Brake Assist" System
I train people on these systems all day long, you should only ever set it off in panic braking, the system measures the speed you apply the brake pedal not the force applied
If your are setting it off frequently you are doing something very very wrong with your braking technique in normal driving. (unless there is something wrong with the car but knowing the system I doubt it)
Do you get this on the motorway lots?
I teach the use of modern car safety systems for a living amongst other things, there's not much I don't know about Brake Assist
I train people on these systems all day long, you should only ever set it off in panic braking, the system measures the speed you apply the brake pedal not the force applied
If your are setting it off frequently you are doing something very very wrong with your braking technique in normal driving. (unless there is something wrong with the car but knowing the system I doubt it)Do you get this on the motorway lots?
I teach the use of modern car safety systems for a living amongst other things, there's not much I don't know about Brake Assist
Edited by cptsideways on Thursday 27th August 07:39
Its not on the motorway, ever.
The drive I have to work is mainly on bumpy, poorly maintained B roads.
What happens is that as I come to a halt at the same 3 junctions every day, that there are ridges/bumps in the road, and this is enough to (I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
The drive I have to work is mainly on bumpy, poorly maintained B roads.
What happens is that as I come to a halt at the same 3 junctions every day, that there are ridges/bumps in the road, and this is enough to (I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
bull996 said:
Its not on the motorway, ever.
The drive I have to work is mainly on bumpy, poorly maintained B roads.
What happens is that as I come to a halt at the same 3 junctions every day, that there are ridges/bumps in the road, and this is enough to (I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
Do the hazrads activate when just the ABS cuts in? If so this is'nt normal, hazards are normally only activated with brake assist. You need to double check its not the brake assist going off.The drive I have to work is mainly on bumpy, poorly maintained B roads.
What happens is that as I come to a halt at the same 3 junctions every day, that there are ridges/bumps in the road, and this is enough to (I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
I'd suggest to "test" the brake assist system so you are fully familiar with what it does, this way you can identify it & distinguish from normal braking or abs activity.
Find a clear empty bit of road, double check its clear! try lightly dabbing the brakes but with a fast action on the brake pedal, it usually takes a few good attempts to get the gist of it. You need to keep your foot on the pedal to keep it activating. When it activates its fairly obvious as you get 100% braking regardless of pedal effort until the pedal is released. The pedal pressure usually reduces (the pedal is almost sucked away from your foot) Your rear brake lights will be flashing not that you'll see em & the hazards should activate for a few secs when your stopped or nearly stopped.
I'm pretty sure on the new volvos you also get the seatbelt tensioners pull up on you?? or maybe not.
If your are setting the brake assist off in normal driving, then it could be your foot brake action, again test the system to see if it is you.
If it's definately not you then I'd say something is up with it!
Edited by cptsideways on Thursday 27th August 11:16
cptsideways said:
bull996 said:
Its not on the motorway, ever.
The drive I have to work is mainly on bumpy, poorly maintained B roads.
What happens is that as I come to a halt at the same 3 junctions every day, that there are ridges/bumps in the road, and this is enough to (I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
Do the hazrads activate when just the ABS cuts in? If so this is'nt normal, hazards are normally only activated with brake assist. You need to double check its not the brake assist going off.The drive I have to work is mainly on bumpy, poorly maintained B roads.
What happens is that as I come to a halt at the same 3 junctions every day, that there are ridges/bumps in the road, and this is enough to (I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
I'd suggest to "test" the brake assist system so you are fully familiar with what it does, this way you can identify it & distinguish from normal braking or abs activity.
Find a clear empty bit of road, double check its clear! try lightly dabbing the brakes but with a fast action on the brake pedal, it usually takes a few good attempts to get the gist of it. You need to keep your foot on the pedal to keep it activating. When it activates its fairly obvious as you get 100% braking regardless of pedal effort until the pedal is released. The pedal pressure usually reduces (the pedal is almost sucked away from your foot) Your rear brake lights will be flashing not that you'll see em & the hazards should activate for a few secs when your stopped or nearly stopped.
I'm pretty sure on the new volvos you also get the seatbelt tensioners pull up on you?? or maybe not.
If your are setting the brake assist off in normal driving, then it could be your foot brake action, again test the system to see if it is you.
If it's definately not you then I'd say something is up with it!
Only ever managed to make it do this deliberately on a test track, literally on a test track, not the usual PH euphemism please note.
CPT you are partly wrong. Emergency Brake Assist EBA works exactly as you say.
The EBL (emergency brake lights) are activated when the ABS is triggered for 0.5 seconds or longer. Above 50kph the brake lights flash at a high rate, and below 30 kph the brake lights are continuous and the hazards flash. They continue to flash regardless of the speed of the vehicle until either the accelerator is pressed or they are manually switched off using the hazard flasher switch.
Whilst the book doesn't actually say this, I think it reasonably logical to think that if one has triggered the EBA by virtue of rapid and heavy pressure on the brake pedal, this would be most likely to trigger the ABS and thus the EBL.
Too many TLAs. Phew!
The EBL (emergency brake lights) are activated when the ABS is triggered for 0.5 seconds or longer. Above 50kph the brake lights flash at a high rate, and below 30 kph the brake lights are continuous and the hazards flash. They continue to flash regardless of the speed of the vehicle until either the accelerator is pressed or they are manually switched off using the hazard flasher switch.
Whilst the book doesn't actually say this, I think it reasonably logical to think that if one has triggered the EBA by virtue of rapid and heavy pressure on the brake pedal, this would be most likely to trigger the ABS and thus the EBL.
Too many TLAs. Phew!
ymwoods said:
bull996 said:
(I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.So not necessarily my poor driving, but thanks for pointing out that you are all so superior
My apologies if this is the case, but you know what this place is like 
On a dry road the hazards can be activated without the abs or eba kicking in. Conversly the abs can kick in on a loose surface without the hazards. It's probably worth having the system checked out. Sorry if I came across a bit arrogantly earlier plfrench said:
ymwoods said:
bull996 said:
(I think) just bounce the wheel enough to make it think there is no traction and activate the ABS.
So not necessarily my poor driving, but thanks for pointing out that you are all so superior
My apologies if this is the case, but you know what this place is like So not necessarily my poor driving, but thanks for pointing out that you are all so superior
On a dry road the hazards can be activated without the abs or eba kicking in. Conversly the abs can kick in on a loose surface without the hazards. It's probably worth having the system checked out. Sorry if I came across a bit arrogantly earlier As earlier above only ever managed to trigger it deliberately, but I can imagine that it might be possible in the circs OP describes.
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